Apparatus for stamping



Nov. 28, 1944. Y

C. M. MCVEY APPARATUS Fon STAMPING Filed sept. 15, 1942 n. themachine. It has `of the lubricant suspended in the actuating mechanism.

\ a tank 8 containing a bath l0. Bath I0 volatile carrier in which is suspended a finely Patented Nov. 28, 1944 f APPARA'rUsFoRsTAMPINdg christian M.Mcvey`,`Deni1e,N. n Application september 15, i942. serial No. 458,475

iclaim. (c1. 11e-so)` (Granted under the The invention described herein may be manufactured and used by or for theGovernment for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a process for stamping out metal discs and seating them `in the bottom of `cup-shaped members and apparatus therefor; lmore particularly, it relates to micro thin aluminumwhich is cut intoidiscs and is seated in the bottom of detonator cups.

When thinsheet metal is stamped or punched by a punch having a desired contour, it has been found that particles, or feathersof the metal build up in the punch guides, eventually interfering with successful and efficient `operation of been found that the undesirable condition maybe eliminated by properly lubricating the sheet stock of which the blanks-or discs arestamped.

Accordingly, itis the object of this invention to provide a manufacturing apparatus in which` sheet metal is lubricated and is then fed into a machine which stamps out blanks" of the metal cup-shaped arti-` and seats them in the bottom of cles. Although the invention relates specifically to micro thin aluminum discs seated in detonator cups, it has general application. The lubricant act of March amended April 30, 1928; 370` O.

3, 188s, as G. '157)` bon tetrachloride, and the lubricant is nnely d1- `vided graphite. The tank is provided with a pair of entrancerollers I2 to which the strip feeds upon entering the tank.. The strip then passes under a large submerging roller I4 and over an exit roller I6, whence it passes out of the tank to the stamping machine and the associated feed n mechanism.

the metal from used is graphitepwhich is` preferably applied by immersing the sheet stock in a bathconsisting a highly volatile carrier, such as carbon tetrachloride. Thecarf` rier evaporates quickly, leaving a thin,` uniform layer of the lubricant on the n preferably carried out in one stroke of` thekpunch.

. The specific nature of the invention as well as sheet stock. `The 1 `stamping and seating operations are 54, as shown in Fig. 3,

The machine comprises a base I8 having an upright support 20. A stamping die 22 is mounted for cooperation with a punch` 24 mounted on cross head 26. Spring 28 biases punch 24 away` from the die. Punch24 is actuated by plunger` 30, which in turn is `controlled by` handle 32.

Positioned beneath the die isa block 34 supporting a cup-shapedmember 36, such as a detol natcr cup. l l l Feedmechanism to pull the strip stock through the press is provided.` Friction rollers 318 and 4l)` are mounted `onpedestal 42. Secured to roller 40 `is ratchet wheel 44,` and pawl 46 spring mounted on arm 48 cooperates therewith. A stop 50 on pedestal 42 determines the lower limit of movement of arm 48. Arm 48`is moved `upward to rotate the friction rollers by actuating rod 52, which is itself moved by movement of handle 32; See Fig.` 2.y On the down stroke of handle 32,

spring 54 moves arm 48 down `against stop 50,

snapping pawl 46 over to engage a fresh tooth on the ratchet, Further movement downward of A the handle ymerely serves to compress thespring in arm 48. .l n

Operation-The strip stock feeding through tank 8 is immersed in the bath, picking up a coat--` ing of thebath on both surfaces. As soon as the otherobjects and advantages thereof will clearly` appear from a description of a preferred embodiment as shown in the accompanying drawing in which: l

Fig. 1 of the drawing is a view in elevation, with parts broken away and in section, of apparatus designed to carry out the process of the invention. Fig. 2 shows the strip feed mechanism in the position it takes at the upper limit of travel of Fig. 3 shows the mechanism of Fig. 2rat the lower limit of travel. l

Referring to the drawing in detail, sheet metal strip stock 2 is shown as unwinding from a reel or `spool 4`mounted on a base 6. Stock 2 passes to the lubricating mechanism which consists-of is a highly divided lubricant. The carrier is preferably carstrip leaves the tank, evaporation ofthe highly volatile carrier takes place. By regulating the spacingof tank 8` from the press, the time that it takes any fixed point on the strip to move from the tank to the press can be regulated to permit substantially completeevaporation of the carrier, leaving a thin, uniformi-ihn of lubricant on both sides of the strip. In the press, punch. 24 co' operates with die 22 to stamp a disc of the desired shape out of the strip. The punch moves through the die and seats the disc in the bottom of cup 36. Handle 32 is then raised to permit spring 28 to withdraw the punch. Handle 32 is raised still further to turn friction rollers 38 and 40 through rod 52, Dawl 46, and` ratchet 44, pulling the strip,

. .An apparatus for stamping discs frommetal because rod 52 slides freely strips for seating in cup shape receptacles, comprising a main support, cup supporting means on said support, a stamping die above said cup supporting means, a hollow cylinder above said die whose lower end is in strip guiding relation to said die, said cylinder having an aperture in its lower end, a spring supported punch in said cylinder reciprocable through said aperture, a manually operable plunger on said main support for operating the punch, a strip feed mechanism to one side of the main support comprising a stand-` ard having an upper and a lower feed roll vjournale'd thereon, a ratchet fixed to the lower roll,

l of the plunger.

a rockable arm mounted concentrically with said ratchet roll, a stop to limit downward movement of said arm, a laterally extending member carried by the upper end of the plunger, a rod connecting said member and rockable arm and hav-` ing means on its lower end for engagement with the underside of said rockable arm on the upward movement of the plunger to rotate the ratchet roll, a spiral spring surrounding the rod for returning said rockable arm to normal position against the stop upon the downward movement CHRISTIAN M. MQVEY. 

